When a male has sexual intercourse with a female with large amounts of public hair around the Vigina. The Penis 'fluffs' the public hair with the in and out motion of Sex.
The pubic hair should be at least twice the orginial size for be named a successful 'fluff'.

...And the award for most successful Pussy Fluffer of 2011 goes too...

A submissive, usually a cuckolded male, who performs oral sex on a dominant woman, prior to her having sex with another man, in order to make her sufficiently aroused and lubricated for sexual intercourse.

Mistress Julie's houseboy also doubled as her pussy fluffer. He would clean her luxurious apartment prior to her dates, and then ready his owner for sex with a well-hung bull by going down on her. The bull would take it from there. Sometimes the houseboy would watch his owner get pound fucked, while other times Mistress would send him out of the room.

A female wingman who helps a guy attract other women. Before being introduced, the female wingman (or Pussy Fluffer) would speak well of the guy in question, in essence performing the role of female pussy fluffer.

"Krista spent all evening finding cute girls and introducing them to me. Before I even said hi they were all doe-eyed. She was my own personal pussy fluffer."